Sanding belt machine



Feb. 25, 1947.

Filed Feb. 26, 1945 3 Sheets-Sheet 1 J 6/ 7g 75 I 50 If INVENTOR.

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3 Sheets-Sheet 2 Filed Feb. 26,1945

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H s: NEWTON 2,416,493

SANDING BELT MACHINE Filed Feb. 26, 1945 3 Sheets-Sheet.3

flip/74A ,jAQIM TQ/Y INVENTOR.

Patented Feb. 25, 1947 UNITED STATES PATENT oFncE- f Herman S. Newton,Temple, Tex. Application February 26, 1945, Serial No. 579,739

6 Claims. (01. 51-135) This invention relates to sanding machines andmore particularly to sanding machines employed in wood working. 1

The objects of the invention are, first, to pro- 'vide an all purposesanding machine, in the sense that it is equipped with a double endedworkin head capable of vertical and rotative displacement and, by virtueof spindles on eachend of 'the head, a belt may be used for vertical andhorizontal sanding or, in place of the belt, abrasive surfaces may beapplied to the spindles in-' 'dividually for vertica1 or horizontalsanding. Second, the provision of a sanding head having such flexibilitythat it may be conveniently and quickly moved to a variety of positionsbest suited to the type of work being performed, and third; theprovision of a convertible sanding head capable of operatingvariousforms of wood-working attachments. r Other objects of the inventioninclude a removable work table for supporting various types ofadjustable work fences; a removable platen resisting pressure of work ona'beltsander when employed; a telescoping spring adjustment, combinedwith a tiltable spindle bearin for maintaming-proper tension'on, thebelt sander.

With the foregoing objects as paramount, the invention has furtherreference to certain features of accomplishment which will becomeapparent as the, description proceeds, taken .in connection with theaccompanying drawings wherein:

Figure 1 is a front perspective view of a, sanding machine constructedaccording to the invention, showing the sanding belt disposedhorizontally.

Figure 2 is a similar view on slightly smaller scale, showing the worktable applied and'the sanding belt in vertical position.

Figure 3 is a fragmentary view of the machine cabinet in transversesection, showing the sandend view of the motor pulley section.

Figure 4 is a plan view of the head elevating column casting.

Figure 5 is a plan view of the friction clamping collar for theheadelevating column.

1 Figure 6 is a, side elevational view thereof.

Figure 7 is a front perspective view of the sanding machine showingabrush sander attachment operatively disposed on the idler spindle and anattendant working bridge.

Figure 8 is a plan view of the work table per se, and i Figure 9 is adetail plan view of the work table insert. p 7

Continuing with a more detailed description of the drawing, referencenumeral I0 denotes a cabinet which, for reasons to be presently defined,has a superimposed, removable top section I l, shown in Figure 2. Thecabinet III has a false top l2 through the center of which extends acylindrical head elevating column l3, operable ivertically by means ofthe mechanism shown inv detail in Figure 3.

In Figure 3, the cabinet, I0 is'shown in trans verse, section with thelower portion deleted.

vWithin this cabinet is arranged an elevating lvertically reciprocates.Mounted upon the flange 15 and secured by bolts I1 is aclamp collar 18,

- shown in detail in Figures 5 and 6. This collar is split and theadjacent ends are equipped with ears I9, one of which is tapped andthreaded.

Through the aligned apertures in these ears is passed a threaded rod 20(Fig. 3) which extends towards and through the front wall of the cabinetl0 and carries a crank 2|, by which an operator in front of the cabinetmay contract and-expand .its top and lower flange 23 which underlie andsupport the false top. l2 about the collar l8 where it protrudes throughthe top l2.

" Spaced upwardly from the bottom of .the mounting I4 is an integralplate 24, upon which rests the lower end of the column l3when'retracted. In the center of this plate, thereis provided a. boss25, embracing an opening through which extends a screw rod 26, carryingacme threads 21. A bearing 28 surrounds a thrust bushing 29, the latter,in turn, being mounted or formed on the rod 26. The rod 26 passesthrough a cross head 30 in the column l3 which is' interiorly threadedto correspond with the threads ofthe rod 26. The-rod 26 carries on ontheend of a shaft-33. The shaft 33 is Jourits lowerend a gear 3|, "whichmeshes with a companion gear 32, mounted naled in an elongated bearing34 in the mounting l4 and extends through the front wall of the cabinetI and carries a wheel 35. A handle 36 ismounted near .the periphery ofthe wheel 35 for convenience in rotating the same.

It is apparent from the foregoing that by rotating the wheel 35, thecolumn I3 is raised or lowered through the medium of the screw rod 26and when the desired elevation and orientation of the headls afiectefdthe crank"?!'ris'rotatedito constrict the clamp collar l8 aboutthecolumn I 3.

Referring now specifically to the sanding head;

it will be observed that tubular members 31 and 38, telescopicallyrelated, serve to carry a m t mounting 39 and an idler spindle bearing411;

respectively. In Figure 3, the motor; designatedj in other figures as4|, has beenomitted to better disclose the mounting casting 39'." Themounting" is held in secure relation to the hollow'gshaf-t' 91f tubularmember 31 by means of a bolt 42 and is so shaped-asto conform to one endof the motor 4|. The opposite end of the "member -31Tis rotat ably heldin a split head" 43, "formed .on the upper end of the elevating columnfl3'and 'which is' proyided with apertured ears 44 (Fig. 3.) throughwhich a bolt is passed to expand or contract-the split head 43 to loosenor tighten the member when it is; desired tochan'gethe position of themotor-4i and the spindle. v

The spindle ;45, which may be hereinafter .re-- ferred to from time to,time as the driving spindle, is mounted on the armature shaft 46 61?the motor 4| and is-held thereon by a counter-sunk set screw 41. Asleeve 48 0f .rubber'or other res'ilient material surrounds this spindleand is of slightly vgreater length than the spindle, asindicate'dinFig'ures 3 and 3B. A cap 49 is disposed .over the end of thesleeve 48 and has a boss 50 which is conformably received in the endofthe sleeve. ,A novel form of securing means tor the cap 4'llto' preventits displacement at high speed cbn's'istso'f apair of screws i and 52having interlocking heads 53 'andfii54 respectively.- It

will be noted"especiallydnFigure 313' that the screw '52 is firstscrewed into place in-the spindle and afterwards, I the companion screw51' is screwed into the cap 49 and 'its head' 53 will be received in thecorrespondingly-shaped recess 55 in the head 54 of the" screw 52 (Fig;3A) In this manner neither screw will become accidentally loosened toanew the cap 49 'td be displaced at highspeeds. Moreover, it is apparentthat by differentially s acing the" cap 4'9 in relation to thef'erid' ofthespindl'e 45,-'variati'onsi'n' expan' 'sio'n ofthe resilient materialofjthe sleeve: .48 will I occur to correspondingly alter'the tension ona sanding-belt mounted on the sleeve. l The sanding belt 56,'whememplo'yed on the machine, as shown in Figuresl and '2, embraces thedriving spindle just described "and an idler kspindl'e consisting ofashaft; 51 and a :sleeve' 58,

also composedof: a lies'ilientmaterial'. The" sleeve 58:isrcompressed'ly retained on thetshaft .5111)? a nut 59,-thiiaidedolrfio the End Of the shaft. "51,

as shown in Figure 3". '"The belt. 5.6 :is: not unlike con ntionalsanding belts-in constmotion;

The smaller of; the twouteiesoopine tubular members-flame 38'which-carries the spindle bearin '4 is:shap d at itsouter end todefine-:a'

sleeve i511 whose axis. transverse tothat of; the

Inember38 and is arcuately cut-awayat .Bl (Fig;

apertures in each side of the sleeve 60 and threaded into alignedopenings in opposite sides of the bearing 43. In this manner, thebearing may be tilted in the sleeve 60 and in being so moved, thespindle 58 will be likewise displaced to cause the sanding belt to trackon the spindles. A belt 63 (Fig. 7) drives the idler spindle from thedriving spindle 45 by virtue of its engagement with the pulley 64 of thedriving spindle and pulley 6.5 of-th'e companion spindle. 'TOTCOIICIOIthe angular displacement of' the idlerspindle as explained, a hand wheel56 (Fig. 3) is provided, by which a screw 6'! in the sleeve 63 is setagainst the lower portion of the bearing so. obviously, sy'aavafiemg thescrew 61, the sanding belt may be centered on the spindles while thelatter are rotating.

The tubular member 38 has a longitudinally disposed key 68 (Fig. 3) heldby screws 69, entering the key through the :companion tubular memhe 3%tohQ h 'r mhe orilza against relative rotation .loutpermittingvlongitudinal displacement. A compression spring Mi is disposed h t e eberfil and e s-a a s z ner Blld'Of the member 33, thrusting the latteroutwardly to maintain tension pnthe sanding; belt sw li v nthe;. r. r .isbe t. 63. i

Aep t-qq ar lisimo it sqnit inner end of the tubular member 31 and hasears 12,, aper tured to receive a bpltj|3 (liligs. 3 and 7), by whichthecollar is contracted on the member 31. A boss 1411s formed on the collarTI and is pro vid d with two int r lv th ead peni s. .15., the largeropeningbeing adapted to receivethe threaded stem ofa star jwheelIBJFigs. 1 and :2) iorthe purpose of holdinga. platen board ll (Fig. 1)and a platen ca lainposition on thework head,.t he former as a backingfor the belt sander 56. The smaller of the openings 15 receives a bolt.tor holding abelt guard, to :be later identified A companion star wheel19 (Figs. 1, and 2) is mounted in the threaded opening 42 of the motormountingt33 tocsecure the opposite end of theiplaten and-cap... v

. It is well understoocl from the foregoing that the operating head ofthe sanding machine is capable of rotation, both ona. vertical axisafforded by the column 13 and on a horizontal axis, byvirtue of the headclamp 43 ofthe elevating column. Thus, the spindles 45 and '58 may bedisposed toope-rate horizontally, as shown in'Figure 1 or vertically, asshown in Figures 2; '3 and7, either wither without-thebelt sander 56.When this element is dispensed with an abrasive sleeve ("not shown) maybe conformably slipped onto one or .both of the spindles for individualuse in' sandring work where suchlimite'd abrasive surface will 'suflice;

murder to properly orientthe spindles, "that is, to dispose them in,true horizontal or vertical planes an arcuate; segment a". (Figs. .3 jand '7) issecured by means oi bo1t'69 to the midsectio'n of tubularmember 31 and complementary. to this segment, a boss bis formed on the-head 43 which supports the elevating column I3. 11-, isobvious thatwhen the workhead isrotated in .the supporting head, the ends of thepredetermin-ately positioned. segment. of willlen gage thef boss: b attwo extreme positions to determine-thehorizontal and verticalpositionsof thespindlesl The false 't'opl2. ofthecabinet is provided with anopening at one end, adapted to accommodate the motor 4] whenthelatter isin lowered end, an opening 8| is provided toreceive the bearing of theidlerspindle 58f To provideazsupport for work against the. belt 56 inthe position shown in Figure 2,,the top;sec= tion ll, earlier mentioned,issuperimposed upon the cabinetlll and upon this"se'ction, there isprovided a flanged top or work table 82; shown an 'lon'gatedopening 83therein which conforms to t'he spindles 48 and58 and the belt 56surrounding the same. tachment, suchas awork ffence? 84 (Fig. 2) may beadjustably mounted on the table 82 at desired angles-to the surface ofthe sanding belt to fa: cilitate sanding.--

It is to be understood that the work table II is not merely an accessorybut instead constitutes a part of the machine. It is disposed upon thebase portion of the machine and requires no means of securement. Theremovability'of the work table without complications leaves the workinghead in the proper working plane without necessity for raising orlowering the same as in some other machines and this feature accentuatesthe general flexibility of the present machine.

Should it be desired to dispense with the sanding belt 56 and employonly the spindles with abrasive sleeves, an insert 85 (Fig. 9), isplaced in the opening 83 of the table, to rest upon the strips 86 in thesides of the opening. A locating strip 81 is disposed transversely onthe insert 85 whose ends are receivable in notches 88 of the strips 86to properly dispose the insert in relation to the spindles 48 and '58and the ends 89 of the insert are cut to conform to these spindles.

In Figure 1 the sanding head is shown as a horizontal belt sander withthe Work table removed. A work fence 90 is adjustably mounted on thehead to hold the work operative against the belt.

In Figure '7, thehead is shown as rotated to a position to dispose thespindles vertically and on the idler spindle a brush sander 9| ismounted. This brush sander is of conventional construcin a detail planview in Figure il. This table has It isapparent that a'n at- I tion andhas a hollow core which receives the expandable sleeve of the spindle bywhich it is held supported upon a base 93 is cut away at 94 to con-'formably receive the brush sander 9|. The base 93 is bolted to the falsetop l2 of the cabinet at 95. It will be observed also in Figure 7 that aguard 96 is provided for the belt 63 and is secured to the collar II andmotor casting 39 by screws 91.

From the foregoing it is apparent that by virtue of the flexibility ofthe sanding head, a highly versatile machine is afiorded.

Manifestly, the construction as shown and described is capable of somemodification and such modification as may be construed to fall withinthe scope and meaning of the appended claims is also considered to bewithin the spirit and intent of the invention.

What is claimed is: h

1. A sanding machine including a cabinet having a false top and aremovable top section having a work table thereon, a work headsupporting column vertically reciprocable in said cabinet, a work headcarried by said column comprised of telescopically related tubularmembers rotatably mounted on said column, means for limiting rotativedisplacement of said head, work spindles mounted on the outer end ofeach of said tubular members whose axes are at right angles to that ofsaid members, expansible sleeves carried by said spindles, sanding meanson said spindles; a motor-supported byjone of said' tubu-i its ends onsaidcolumn, said-work head-dompris ing telescopically related tubularmembersrotat ably mounted on said" column transverse to'the axisthereof, a spindle mounted on the outer end of each of said memberswhose axes are substantially at right angles tothe common axis of saidmembers, and arranged to carry a'sanding belt, spring means whollywithin one of said tubular members for axially expanding said tubularmembers to maintain constant tension on said belt, a motor suspendedfrom one of said members for driving the spindle thereon, means fordriving the companion spindle from said first spindle, means for tiltingsaid companion spindle for tracking said sanding belt, means for raisingand lowering said column and means for securing said column in adjustedpositions.

3. In a sanding machine, a cabinet having a removable work table, arotatable work head supporting column mounted for vertical movement inrelation to said table, a longitudinally adjustable work head rotatablysupported intermediate its ends upon and in transverse relation to saidcolumn, a spindle on one end of said'head capable of tiltingdisplacement, a second spindle on the opposite end of said headsubstantially parallel to said first spindle, a belt connecting saidspindles, an expansible sleeve carried by each ofsaid spindles, a motorfor driving one of said spindles a threaded rod vertically disposed insaid column and means for rotating said rod to vertically actuate saidcolumn.

4. A sanding machine including a cabinet a vertically movable work headsupporting column in said cabinet, telescopically related tubularmembers constituting a working head rotatably supported intermediate itsends upon and in transverse relation to said supporting column, a V

compression spring in one of said tubular members effecting axialextension. of said working head; a spindle on one end of said head,pivotally mounted for tilting displacement, a second spindle on theopposite end of said head and parallel with said first spindle tosupport, an abrasive belt between said spindles, maintained in-centeredposition on said spindles by the tiltability of said first spindle, anexpansible sleeveon each of said spindles, a motor for operating saidsecond spindle, means for driving said spindle from the second spindle,means for actuating said column and means for securing the latter inadjusted positions.

5. A sanding machine including a cabinet hav ing a removable work tablea work head supporting column movable vertically with respect to saidtable a longitudinally adjustable head comprised of telescopicallyrelated tubular members rotatably disposed on and in transverse relation'to said column a coil spring enclosed in one of said tubular membersfor axially extending said head, a spindle at each end of said workhead,

anabrasi' ebelt interchangeably mounted on said spind s and h l un rteno o s i -s rin means'for-driving said spindiesra threaded rod in saidcolumn and. means .for rotating said. rod to raise and iowersaid heacb jV I :6. A machine as described in claim 5, further defined in that oneof thespindles is'mounte'd in a bearing embraced byasleeve secured toone end of said head at right angles to its longitudinal axis; whereinsaid bearing is suspended. on diametrically. opposed pivots for tiltingdisplacement to-efiecttrac iring of a belt traveling thereon and 7 meansfor adjusting the degree of displacement sQ' N T N. 1 I 15 13,061 28 8;mmmcsste n The following references are of record in the file of thispatent:

I UNITED STATES PATENTS v I Q Date I Australian May 1, 1928

